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<?php
namespace LeanCloud;
use LeanCloud\Operation\RelationOperation;
class Relation {
private $parent;
private $key;
private $targetClassName;
public function __construct($parent, $key, $className=null) {
$this->parent = $parent;
$this->key = $key;
$this->targetClassName = $className;
}
public function encode() {
return array("__type" => "Relation",
"className" => $this->targetClassName);
}
public function setParentAndKey($parent, $key) {
if ($this->parent && $this->parent != $parent) {
throw new \RuntimeException("Relation does not belong to the object");
}
if ($this->key && $this->key != $key) {
throw new \RuntimeException("Relation does not belong to the field");
}
$this->parent = $parent;
$this->key = $key;
}
public function getTargetClassName() {
return $this->targetClassName;
}
public function add($objects) {
if (!is_array($objects)) { $objects = array($objects); }
$op = new RelationOperation($this->key, $objects, null);
$this->parent->set($this->key, $op);
if (!$this->targetClassName) {
$this->targetClassName = $op->getTargetClassName();
}
}
public function remove($objects) {
if (!is_array($objects)) { $objects = array($objects); }
$op = new RelationOperation($this->key, null, $objects);
$this->parent->set($this->key, $op);
if (!$this->targetClassName) {
$this->targetClassName = $op->getTargetClassName();
}
}
public function getQuery() {
if ($this->targetClassName) {
$query = new Query($this->targetClassName);
} else {
$query = new Query($this->parent->getClassName());
$query->addOption("redirectClassNameForKey", $this->key);
}
$query->relatedTo($this->key, $this->parent);
return $query;
}
public function getReverseQuery(LeanObject $child) {
$query = new Query($this->parent->getClassName());
$query->equalTo($this->key, $child->getPointer());
return $query;
}
}